A change in temperature modulates defence to yellow (stripe) rust in wheat line UC1041 independently of resistance gene Yr36.
A change in temperature modulates defence to yellow (stripe) rust in wheat line UC1041 independently of resistance gene Yr36.
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DOI：
10.1186/1471-2229-14-10
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发表时间：
2014-01-08
影响因子：
5.3
通讯作者：
Ridout CJ
中科院分区：
文献类型：
--
作者：
Bryant RR;McGrann GR;Mitchell AR;Schoonbeek HJ;Boyd LA;Uauy C;Dorling S;Ridout CJ
锈病是世界范围内小麦生产中的重要病害。随着新的锈菌品种的不断进化及其对更高温度的适应，持续和持久的抗病性是一个关键挑战。环境条件影响抗性基因的表现，但其基础知之甚少。在这里，我们表明，在白天温度的变化影响小麦抗条锈菌f。小麦条锈菌（Pst），是条锈病的病原。使用近等基因系UC 1041 +/-Yr 36的成年植物，在18°C或25°C的日间温度下生长的成年UC 1041 + Yr 36植物中的植物中的Pst百分比夏孢子覆盖率之间没有显著差异。然而，当植物转移到较低的白天温度在接种Pst时，感染增加了两倍。有趣的是，这种反应独立于Yr 36，Yr 36先前被报道为温度响应性抗性基因，因为成年UC 1041-Yr 36植物中的Pst发育类似地受到经历温度降低的植物的影响。此外，UC 1041-Yr 36植物生长在较低的温度，然后转移到较高的温度是有效的电阻和温度变化在任一方向上显示影响Pst发展到8天前接种。幼苗的结果相似，但与成年植物相比变化更大。UC 1041和三叶草幼苗在高温下对Pst的抗性增强。在任一方向的温度变化的品种Solstice的幼苗电阻没有受到影响。Yr 36在18°C下有效，与先前的研究相比，细化了赋予抗Pst的较低温度范围。结果揭示了以前未表征的防御温度敏感性在UC 1041的背景下，这是由温度的变化和独立的Yr 36。这种新的表型是存在于一些品种，但在其他人缺席，这表明Pst防御可能是更稳定的一些品种比其他植物暴露于不同的温度。
Rust diseases are of major importance in wheat production worldwide. With the constant evolution of new rust strains and their adaptation to higher temperatures, consistent and durable disease resistance is a key challenge. Environmental conditions affect resistance gene performance, but the basis for this is poorly understood. Here we show that a change in day temperature affects wheat resistance to Puccinia striiformis f. sp tritici (Pst), the causal agent of yellow (or stripe) rust. Using adult plants of near-isogenic lines UC1041 +/- Yr36, there was no significant difference between Pst percentage uredia coverage in plants grown at day temperatures of 18°C or 25°C in adult UC1041 + Yr36 plants. However, when plants were transferred to the lower day temperature at the time of Pst inoculation, infection increased up to two fold. Interestingly, this response was independent of Yr36, which has previously been reported as a temperature-responsive resistance gene as Pst development in adult UC1041 -Yr36 plants was similarly affected by the plants experiencing a temperature reduction. In addition, UC1041 -Yr36 plants grown at the lower temperature then transferred to the higher temperature were effectively resistant and a temperature change in either direction was shown to affect Pst development up to 8 days prior to inoculation. Results for seedlings were similar, but more variable compared to adult plants. Enhanced resistance to Pst was observed in seedlings of UC1041 and the cultivar Shamrock when transferred to the higher temperature. Resistance was not affected in seedlings of cultivar Solstice by a temperature change in either direction. Yr36 is effective at 18°C, refining the lower range of temperature at which resistance against Pst is conferred compared to previous studies. Results reveal previously uncharacterised defence temperature sensitivity in the UC1041 background which is caused by a change in temperature and independently of Yr36. This novel phenotype is present in some cultivars but absent in others, suggesting that Pst defence may be more stable in some cultivars than others when plants are exposed to varying temperatures.
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